Relay



June 15 1926. 1,589,055

R. w. cousms RELAY Original Filed NOV. 25 1921 J j zvefzz or ,1

Coward;

Patented June 15, 1926.

UNITED, STATES PATENT- OFFICE.

aonnm w. COUSINS, or our, mums RELAY.

Original application filed November 25, 1921, Serial 1T0. 517,544.Divided and January 29, 1923.

My invention relates to relays to be used more particularly as elementsof starting mechanisms for electric motors and involving a plurality ofresistance units, or sections, to be automatically cut out of the motorcircuit, in succession, to supply to the motor, when all of theresistance units, or sections, are cut out the desired amount ofcurrent'for operating the motor, with the desired accelerations, thesubject matter of the present application being divided out of mypending application for United States Th patent on starting apparatusfor D. C. mo-

tors, Serial No. 517,544, filed November 25,

My primary object is to provide a novel,'

7 cut out, in succession, to effect the desired quick starting of themotor, all of the resistance units, or sections, in the motor circuit,regardless of the failure of the motor to start and regardless of theloads imposed on the motor during any of its periods of acceleration;and other objects as will be manifest from the following description.

Referring to theaccompanying drawings: Figure 1 is a broken view in sideelevation of the relay. Figure 2 is a face View of one of the severalsimilar laminations forming a part of the core of the relay. Figure 3 isa front View of the construction shown in Fig. 1. Figure 4 is a sectiontaken at the line 4 on Fig. 1 and viewed in the direction of the arrow.Figure 5 is a plan view of the relay; and Figure 6 a perspective view ofthe members forming the lower portion of the relay and involving contactelements, these various parts being shown in disassembled, yet relatedcondition.

.plates 14 and thin application fled Serial No. 615,625.

15 and 16, these various laminations and plates being rigidly securedtogether as by means of the rivets represented at 17. The core-structurethus provided is secured agalnst the of the screw 18 which passesthrough this board and screws into the core-structure referred to, andby means of the threaded stud 19 pro ecting rearwardly from saidcorestructure throu h an openin in the board 11 and clamped in positione laminations of the section 13 thereof, these laminations beingrepresented at 21, are preferably of the form shown in Fig. 2, which maybe produced by milling out the sheets to provide the three legs 22,23and 24; the laminations of the section 12, re resented at 25, being ofthe same shape anti form as the laminations 21, except that the portionsthereof above the plane of the upper surface of the leg 23 is omitted,the plates 14 and 15 being of the same form as the laminations 21 andthe plate 16 of the same form as the laminations 25. The leg thusprovided by the portions 22 of the laminations 21 and 25 and the similarportions of the plates 21, supports a coil 26 of insulated wire, and thel g ormed by the portions 24 of the laminations 21 an the similarportions of the 15 supports a shading coil 27 consisting of a solidspool of copper, containing an opening therethrough at which itsurrounds the leg portion last referred to. The relay also comprises ayoke-frame 28 rigidly connected at its ends with the board 11, asthrough the medium of the nuts 29,

face of the board 11, as by means y the nut 20.

this yoke partially surrounding the upper end of the laminatedcore-structure referred to. The plates 15 and 16 extend below the coil26 and provide the forwardly projectin spaced-apart arms 30 in whicha'cross-sha 31 is secured, this shaft having journaled thereon armaturescomprising, respectively, lever arms 32 and 33, these arms being spacedapart and spaced from the plates 30 by spacers 34 surrounding the shaft31. The arms 32 and- 33 at their upper ends are of laminatedconstruction, the laminations on the arm 32 being represented at 35, andthose on the arm 33, at 36, the laminations of these respective armsbeing located at oplid posite sides of the arms and rigidly securedthereto, as through the medium of the rivets 37 and 38. The laminations35 oppose the outer ends oil the pole-pieces formed by the legs 22 and23, these laminations being formed in sections to provide the gap 39;and the laminations 36 oppose the pole-pieces formed by the leg portions22, 23 and 24;, these laminations being formed in sections to providethe gap it). The arms 32 and 33 are of bell-crank form andengage theshatt 31 at their angles, the lower surfaces of theirrearwardly-extending, ends being rounded as represented at dl. Thearmaturestructures thus provided, for cooperating with the polesattended by the leg portions 22, 23 and 24, as stated, are normally heldin spaced relation to these poles, as shown in Figs. l and 5, by meansoi coil springs t2 one for each of the armatures, these springs beingconnected at their lower ends with the rear ends of the a 32 and 33,respectively, and at their upper ends with a cross-pin 43 secured in theplates 15 and l6. Positioned between the plates 15 and 16 to extendcrosswise thereof and secured thereto, as by screws n, is a plate d5 oflshape, from the lower end oi which a pm at torwardly extends, this pinforming a pivotal support for a depending rod l? journaled on the pin 46at an opening the rod. The rod l? is provided with a steppeddish 4-9rigidly secured thereto below the pivot-pin C6, and with a secondstepped= dish 50 surrounding the rod 4:? above the a disk 49 and freelymovable up and down till on the rod 427, except as restrained by a coilspring 51 surrounding the rod 4:? and the reduced portions olfthe diskst9 and 50, and hearing at its ends against the enlarged portions ofthese dislrs, this spring operating to yieldingly force the dish 50against the curved portions t]. of the arms 32 and 33, The lower end oithe rod 42'? is provided with a contact 52, which opposes, andcooperates with, a contact 53 carried on the outer end oi a rod e lrigidly secured in, and projecting forwardly from, the board ll, therear end of this rod forming a binding post. The frame 28 is providedwith a rearwardlyextending contact-member 55 with which contact 56 onthe armature 33 cooperates, the contact 56 engaging with the con tact 55in the normal condition oil the-apperatus, and the armature 32 hearingagainst block 32 of insulating material on the yolre 28, in thiscondition oil the ap- The operation of the relay is as follows: non therelay coil 26 is energized both of the arms 32 and 33 reel: incloclrwise direction in Fig. 1 against the spring resistance referredto, the arm 33 disengaging from. the contact 55.. in this operation bothof the arms 32 and 33 exert uniform downward pressure on the dish 50 atopposite sides of the rod 47 so that the normal position oil this rod isnot disturbed.

When the coil 26becomes deenergized the arm 32 swings back to normalposition but as the flux produced bv the current in the shading coil 27is out oi the time phase with that produced by the current in the coil26 this shading coil operates to cause the arm 33 to remain in theposition to which it was operated by the energizing of the coil 26, solong as the current traverses the shading coil, The moment the arm 32returns to normal position, as stated, the rod at? by the action of thespring 51, swings to the left in Fig. 3 and the contacts 52 and 53engage. As soon as current ceases to traverse the shading coil thecontacts 52 and 53 disengage and the contacts 55 and 56 engage.

The provision of the relay thus constructed and operating as stated isoil great value in controlling circuits, particularly when constitutingone of the elements or: the apparatus forming the subject oi" my(ac-pending, above-reierred-to, application.

till

l have illustrated and described a particular construction oi relayembodying my invention, l do not wish to be understood as intending tlimit it thereto as the con struction shown may be variously modifiedand altered without departing from thespirit of my invention.Furthermore, w e l have described my improved relay as torming anelement of a particular construction or starting mechanism for anelectric motor, l do not wish to be understood as intending to limit itto its use in this particular combination.

What ll claim as new, and desire to secure by Letters Patent, is: p

l. A; relay comprising a plurality of independently movable armatures, acore equipped with a shading coil, said shading coil cooperating withone only of said armatures, means for energizing said core to attractboth of said armatures, a contact-device formed of relatively movableelements, and means cooperating with said armatures and with the movableone of said elements for controlling the position of the movable one ofelements, said means including a tension device which is operated byboth of said armatures, when the latter are drawn out of normalposition, without affecting the normal condition of said contact device,but upon return of one of said armatures to normal condition while theother remains at tracted by said shading coil, exerts its stored up enery on the movable element oil said contactevice to move the latterrelative to n the other of said elements.

2. A relay comprising a plurality of independently pivoted armatures, acore equipped with a shading coil, said shading coil-co operating withone only or" said 'armatures,

ltd

means 'for energizing said core to attract said spring operating whenone of said armaboth of said armatures, a contactrdevice one turesreturns to "normal position while the 1 of the elements of which ispivotal mountother of said armatures remains attracted ed, and a springbearing against sai pivoted by said shading coil, to swing said pivoted8 element, said armatures operating against contact-element relative tothe other of said said spring to place the latter under stress elements.when both are attracted without aflectin the condition of saidcontact-device, an ROBERT W, COUSINS.

